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Commit 7b25bcdf authored by Chris Lattner's avatar Chris Lattner
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* Substantially simplify how free instructions are handled (potentially fixing 

  a bug in DSE).
* Delete dead operand uses iteratively instead of recursively, using a
  SetVector.
* Defer deletion of dead operand uses until the end of processing, which means
  we don't have to bother with updating the AliasSetTracker.  This speeds up
  DSE substantially.

llvm-svn: 15204
parent 461c1f98
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